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Infrared study of the spin reorientation transition and its reversal in the superconducting state in underdoped ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$

Mallett, B. P. P. ; Maršík, Premysl ; Yazdi-Rizi, M. ; Wolf, Th. ; Böhmer, A. E. ; Hardy, F. ; Meingast, C. ; Munzar, Dominik ; Bernhard, Christian

In: Physical Review Letters, 2015, vol. 115, no. 2, p. 027003

With infrared spectroscopy we investigated the spin-reorientation transition from an orthorhombic antiferromagnetic (o-AF) to a tetragonal AF (t-AF) phase and the reentrance of the o-AF phase in the superconducting state of underdoped Ba1−xKxFe2As2. In agreement with the predicted transition from a single-Q to a double-Q AF structure, we found that a distinct spin density wave develops in the...